1020399951698 has 8 divisors (see below), whose sum is σ = 1530610868208. Its totient is φ = 510196328964.

The previous prime is 1020399951691. The next prime is 1020399951773. The reversal of 1020399951698 is 8961599930201.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1020399951698² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1020399951698.

It is not an unprimeable number, because it can be changed into a prime (1020399951691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1459136 + ... + 2042027.

It is an arithmetic number, because the mean of its divisors is an integer number (191326358526).

Almost surely, 2^{1020399951698} is an apocalyptic number.

1020399951698 is a deficient number, since it is larger than the sum of its proper divisors (510210916510).

1020399951698 is a wasteful number, since it uses less digits than its factorization.

1020399951698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3646888.

The product of its (nonzero) digits is 9447840, while the sum is 62.

The spelling of 1020399951698 in words is "one trillion, twenty billion, three hundred ninety-nine million, nine hundred fifty-one thousand, six hundred ninety-eight".