64531731477 has 8 divisors (see below), whose sum is σ = 86479072416. Its totient is φ = 42802772432.

The previous prime is 64531731469. The next prime is 64531731533. The reversal of 64531731477 is 77413713546.

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 64531731477 - 2³ = 64531731469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64531731427) 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, 54594783 + ... + 54595964.

It is an arithmetic number, because the mean of its divisors is an integer number (10809884052).

Almost surely, 2^64531731477 is an apocalyptic number.

It is an amenable number.

64531731477 is a deficient number, since it is larger than the sum of its proper divisors (21947340939).

64531731477 is a wasteful number, since it uses less digits than its factorization.

64531731477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109190947.

The product of its digits is 1481760, while the sum is 48.

The spelling of 64531731477 in words is "sixty-four billion, five hundred thirty-one million, seven hundred thirty-one thousand, four hundred seventy-seven".