1020405656156 has 6 divisors (see below), whose sum is σ = 1785709898280. Its totient is φ = 510202828076.

The previous prime is 1020405656141. The next prime is 1020405656167. The reversal of 1020405656156 is 6516565040201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127550707016 + ... + 127550707023.

It is an arithmetic number, because the mean of its divisors is an integer number (297618316380).

Almost surely, 2^{1020405656156} is an apocalyptic number.

It is an amenable number.

1020405656156 is a deficient number, since it is larger than the sum of its proper divisors (765304242124).

1020405656156 is a wasteful number, since it uses less digits than its factorization.

1020405656156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255101414043 (or 255101414041 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 41.

The spelling of 1020405656156 in words is "one trillion, twenty billion, four hundred five million, six hundred fifty-six thousand, one hundred fifty-six".