402660651 has 4 divisors (see below), whose sum is σ = 536880872. Its totient is φ = 268440432.

The previous prime is 402660647. The next prime is 402660659. The reversal of 402660651 is 156066204.

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

It is not a de Polignac number, because 402660651 - 2² = 402660647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402660659) 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, 67110106 + ... + 67110111.

It is an arithmetic number, because the mean of its divisors is an integer number (134220218).

Almost surely, 2^402660651 is an apocalyptic number.

402660651 is a deficient number, since it is larger than the sum of its proper divisors (134220221).

402660651 is a wasteful number, since it uses less digits than its factorization.

402660651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134220220.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 402660651 is about 20066.4060309762. The cubic root of 402660651 is about 738.4363445840.

The spelling of 402660651 in words is "four hundred two million, six hundred sixty thousand, six hundred fifty-one".