651265551 has 12 divisors (see below), whose sum is σ = 944068320. Its totient is φ = 432630240.

The previous prime is 651265547. The next prime is 651265553. The reversal of 651265551 is 155562156.

It is not a de Polignac number, because 651265551 - 2² = 651265547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651265553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 126231 + ... + 131288.

It is an arithmetic number, because the mean of its divisors is an integer number (78672360).

Almost surely, 2^651265551 is an apocalyptic number.

651265551 is a deficient number, since it is larger than the sum of its proper divisors (292802769).

651265551 is a wasteful number, since it uses less digits than its factorization.

651265551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257806 (or 257803 counting only the distinct ones).

The product of its digits is 45000, while the sum is 36.

The square root of 651265551 is about 25519.9049959047. The cubic root of 651265551 is about 866.8009304973.

The spelling of 651265551 in words is "six hundred fifty-one million, two hundred sixty-five thousand, five hundred fifty-one".