1256572472656 has 20 divisors (see below), whose sum is σ = 2518561206900. Its totient is φ = 606621193472.

The previous prime is 1256572472653. The next prime is 1256572472663. The reversal of 1256572472656 is 6562742756521.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 241556522256 + 1015015950400 = 491484^2 + 1007480^2 .

It is a Harshad number since it is a multiple of its sum of digits (58).

It is a self number, because there is not a number n which added to its sum of digits gives 1256572472656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256572472653) 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, 1354064701 + ... + 1354065628.

It is an arithmetic number, because the mean of its divisors is an integer number (125928060345).

Almost surely, 2^{1256572472656} is an apocalyptic number.

1256572472656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1256572472656 is an abundant number, since it is smaller than the sum of its proper divisors (1261988734244).

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

1256572472656 is a wasteful number, since it uses less digits than its factorization.

1256572472656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2708130366 (or 2708130360 counting only the distinct ones).

The product of its digits is 42336000, while the sum is 58.

The spelling of 1256572472656 in words is "one trillion, two hundred fifty-six billion, five hundred seventy-two million, four hundred seventy-two thousand, six hundred fifty-six".