64402278436923 has 48 divisors (see below), whose sum is σ = 105958134983424. Its totient is φ = 34068707504640.

The previous prime is 64402278436921. The next prime is 64402278436939. The reversal of 64402278436923 is 32963487220446.

It is not a de Polignac number, because 64402278436923 - 2¹ = 64402278436921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64402278436921) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 86610765 + ... + 87351182.

It is an arithmetic number, because the mean of its divisors is an integer number (2207461145488).

Almost surely, 2^{64402278436923} is an apocalyptic number.

64402278436923 is a deficient number, since it is larger than the sum of its proper divisors (41555856546501).

64402278436923 is a wasteful number, since it uses less digits than its factorization.

64402278436923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173962052 (or 173962035 counting only the distinct ones).

The product of its (nonzero) digits is 83607552, while the sum is 60.

The spelling of 64402278436923 in words is "sixty-four trillion, four hundred two billion, two hundred seventy-eight million, four hundred thirty-six thousand, nine hundred twenty-three".