655624312551 has 48 divisors (see below), whose sum is σ = 1026377614080. Its totient is φ = 400886599680.

The previous prime is 655624312523. The next prime is 655624312559. The reversal of 655624312551 is 155213426556.

655624312551 is a `hidden beast` number, since 6 + 5 + 5 + 62 + 4 + 31 + 2 + 551 = 666.

It is not a de Polignac number, because 655624312551 - 2¹¹ = 655624310503 is a prime.

It is a super-2 number, since 2×655624312551² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 655624312497 and 655624312506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655624312559) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25759690 + ... + 25785128.

It is an arithmetic number, because the mean of its divisors is an integer number (21382866960).

Almost surely, 2^655624312551 is an apocalyptic number.

655624312551 is a deficient number, since it is larger than the sum of its proper divisors (370753301529).

655624312551 is a wasteful number, since it uses less digits than its factorization.

655624312551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26856 (or 26853 counting only the distinct ones).

The product of its digits is 1080000, while the sum is 45.

The spelling of 655624312551 in words is "six hundred fifty-five billion, six hundred twenty-four million, three hundred twelve thousand, five hundred fifty-one".