256723771252455 has 64 divisors (see below), whose sum is σ = 502935696721920. Its totient is φ = 123447852759168.

The previous prime is 256723771252393. The next prime is 256723771252499. The reversal of 256723771252455 is 554252177327652.

256723771252455 is a `hidden beast` number, since 2 + 5 + 6 + 7 + 2 + 37 + 71 + 2 + 524 + 5 + 5 = 666.

It is not a de Polignac number, because 256723771252455 - 2¹⁴ = 256723771236071 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256723771252392 and 256723771252401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1700870479 + ... + 1701021408.

It is an arithmetic number, because the mean of its divisors is an integer number (7858370261280).

Almost surely, 2^{256723771252455} is an apocalyptic number.

256723771252455 is a deficient number, since it is larger than the sum of its proper divisors (246211925469465).

256723771252455 is a wasteful number, since it uses less digits than its factorization.

256723771252455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3401891957 (or 3401891951 counting only the distinct ones).

The product of its digits is 246960000, while the sum is 63.

The spelling of 256723771252455 in words is "two hundred fifty-six trillion, seven hundred twenty-three billion, seven hundred seventy-one million, two hundred fifty-two thousand, four hundred fifty-five".