6403642651 has 8 divisors (see below), whose sum is σ = 7516244960. Its totient is φ = 5340489408.

The previous prime is 6403642639. The next prime is 6403642657. The reversal of 6403642651 is 1562463046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6403642651 - 2²¹ = 6401545499 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a self number, because there is not a number n which added to its sum of digits gives 6403642651.

It is not an unprimeable number, because it can be changed into a prime (6403642657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12361986 + ... + 12362503.

It is an arithmetic number, because the mean of its divisors is an integer number (939530620).

Almost surely, 2^6403642651 is an apocalyptic number.

6403642651 is a deficient number, since it is larger than the sum of its proper divisors (1112602309).

6403642651 is a wasteful number, since it uses less digits than its factorization.

6403642651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24724533.

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 6403642651 is about 80022.7633301925. The cubic root of 6403642651 is about 1856.9877101424.

The spelling of 6403642651 in words is "six billion, four hundred three million, six hundred forty-two thousand, six hundred fifty-one".