64401974523 has 6 divisors (see below), whose sum is σ = 93025074324. Its totient is φ = 42934649676.

The previous prime is 64401974521. The next prime is 64401974563. The reversal of 64401974523 is 32547910446.

64401974523 is a `hidden beast` number, since 6 + 4 + 4 + 0 + 197 + 452 + 3 = 666.

It is not a de Polignac number, because 64401974523 - 2¹ = 64401974521 is a prime.

It is a super-2 number, since 2×64401974523² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64401974521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3577887465 + ... + 3577887482.

It is an arithmetic number, because the mean of its divisors is an integer number (15504179054).

Almost surely, 2^64401974523 is an apocalyptic number.

64401974523 is a deficient number, since it is larger than the sum of its proper divisors (28623099801).

64401974523 is a wasteful number, since it uses less digits than its factorization.

64401974523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7155774953 (or 7155774950 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The spelling of 64401974523 in words is "sixty-four billion, four hundred one million, nine hundred seventy-four thousand, five hundred twenty-three".