64120731537 has 8 divisors (see below), whose sum is σ = 85501733536. Its totient is φ = 42743441952.

The previous prime is 64120731527. The next prime is 64120731583. The reversal of 64120731537 is 73513702146.

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

It is not a de Polignac number, because 64120731537 - 2⁸ = 64120731281 is a prime.

It is a super-2 number, since 2×64120731537² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64120731495 and 64120731504.

It is not an unprimeable number, because it can be changed into a prime (64120731527) 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, 887548 + ... + 957069.

It is an arithmetic number, because the mean of its divisors is an integer number (10687716692).

Almost surely, 2^64120731537 is an apocalyptic number.

It is an amenable number.

64120731537 is a deficient number, since it is larger than the sum of its proper divisors (21381001999).

64120731537 is a wasteful number, since it uses less digits than its factorization.

64120731537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1856207.

The product of its (nonzero) digits is 105840, while the sum is 39.

The spelling of 64120731537 in words is "sixty-four billion, one hundred twenty million, seven hundred thirty-one thousand, five hundred thirty-seven".