78961104666 has 64 divisors (see below), whose sum is σ = 187042560000. Its totient is φ = 24619426416.

The previous prime is 78961104653. The next prime is 78961104667. The reversal of 78961104666 is 66640116987.

It is a happy number.

It is a super-3 number, since 3×78961104666³ (a number of 34 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (78961104667) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 406036 + ... + 568143.

It is an arithmetic number, because the mean of its divisors is an integer number (2922540000).

Almost surely, 2^78961104666 is an apocalyptic number.

78961104666 is an abundant number, since it is smaller than the sum of its proper divisors (108081455334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78961104666 is a wasteful number, since it uses less digits than its factorization.

78961104666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 974288 (or 974282 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The spelling of 78961104666 in words is "seventy-eight billion, nine hundred sixty-one million, one hundred four thousand, six hundred sixty-six".