1256155661310 has 32 divisors (see below), whose sum is σ = 3288843914112. Its totient is φ = 304522584480.

The previous prime is 1256155661297. The next prime is 1256155661317. The reversal of 1256155661310 is 131665516521.

It is a super-2 number, since 2×1256155661310² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256155661317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1903265824 + ... + 1903266483.

It is an arithmetic number, because the mean of its divisors is an integer number (102776372316).

Almost surely, 2^{1256155661310} is an apocalyptic number.

1256155661310 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1256155661310 is an abundant number, since it is smaller than the sum of its proper divisors (2032688252802).

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

1256155661310 is a wasteful number, since it uses less digits than its factorization.

1256155661310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3806532328.

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 1256155661310 in words is "one trillion, two hundred fifty-six billion, one hundred fifty-five million, six hundred sixty-one thousand, three hundred ten".