655036651 has 4 divisors (see below), whose sum is σ = 655479832. Its totient is φ = 654593472.

The previous prime is 655036649. The next prime is 655036661. The reversal of 655036651 is 156630556.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 655036651 - 2¹ = 655036649 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 655036651.

It is not an unprimeable number, because it can be changed into a prime (655036661) 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, 219366 + ... + 222331.

It is an arithmetic number, because the mean of its divisors is an integer number (163869958).

Almost surely, 2^655036651 is an apocalyptic number.

655036651 is a deficient number, since it is larger than the sum of its proper divisors (443181).

655036651 is a wasteful number, since it uses less digits than its factorization.

655036651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443180.

The product of its (nonzero) digits is 81000, while the sum is 37.

The square root of 655036651 is about 25593.6838106592. The cubic root of 655036651 is about 868.4707583045.

The spelling of 655036651 in words is "six hundred fifty-five million, thirty-six thousand, six hundred fifty-one".