6446762721 has 12 divisors (see below), whose sum is σ = 10642275072. Its totient is φ = 3683864376.

The previous prime is 6446762657. The next prime is 6446762753. The reversal of 6446762721 is 1272676446.

6446762721 is a `hidden beast` number, since 64 + 467 + 62 + 72 + 1 = 666.

It is not a de Polignac number, because 6446762721 - 2⁶ = 6446762657 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6446762221) 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, 51164721 + ... + 51164846.

It is an arithmetic number, because the mean of its divisors is an integer number (886856256).

Almost surely, 2^6446762721 is an apocalyptic number.

It is an amenable number.

6446762721 is a deficient number, since it is larger than the sum of its proper divisors (4195512351).

6446762721 is a wasteful number, since it uses less digits than its factorization.

6446762721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102329580 (or 102329577 counting only the distinct ones).

The product of its digits is 677376, while the sum is 45.

The square root of 6446762721 is about 80291.7350727956. The cubic root of 6446762721 is about 1861.1465087180.

The spelling of 6446762721 in words is "six billion, four hundred forty-six million, seven hundred sixty-two thousand, seven hundred twenty-one".