1856640129104 has 40 divisors (see below), whose sum is σ = 3601506983592. Its totient is φ = 927219363840.

The previous prime is 1856640129073. The next prime is 1856640129121. The reversal of 1856640129104 is 4019210466581.

It can be written as a sum of positive squares in 4 ways, for example, as 920515600 + 1855719613504 = 30340^2 + 1362248^2 .

It is a super-2 number, since 2×1856640129104² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111615572 + ... + 111632204.

Almost surely, 2^{1856640129104} is an apocalyptic number.

It is an amenable number.

1856640129104 is a deficient number, since it is larger than the sum of its proper divisors (1744866854488).

1856640129104 is a wasteful number, since it uses less digits than its factorization.

1856640129104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24495 (or 24489 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 47.

The spelling of 1856640129104 in words is "one trillion, eight hundred fifty-six billion, six hundred forty million, one hundred twenty-nine thousand, one hundred four".