655399722351 has 48 divisors (see below), whose sum is σ = 1023267611520. Its totient is φ = 371771928000.

The previous prime is 655399722349. The next prime is 655399722379. The reversal of 655399722351 is 153227993556.

655399722351 is a nontrivial binomial coefficient, being equal to C(1144902, 2).

It is not a de Polignac number, because 655399722351 - 2¹ = 655399722349 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a junction number, because it is equal to n+sod(n) for n = 655399722291 and 655399722300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655399722391) 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, 1 + ... + 1144901.

It is an arithmetic number, because the mean of its divisors is an integer number (21318075240).

Almost surely, 2^655399722351 is an apocalyptic number.

655399722351 is the 1144901-st triangular number and also the 572451-st hexagonal number.

655399722351 is a deficient number, since it is larger than the sum of its proper divisors (367867889169).

655399722351 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (655399722350) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (1145017).

655399722351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1145028 (or 1145017 counting only the distinct ones).

The product of its digits is 15309000, while the sum is 57.

The spelling of 655399722351 in words is "six hundred fifty-five billion, three hundred ninety-nine million, seven hundred twenty-two thousand, three hundred fifty-one".