64987539961 has 8 divisors (see below), whose sum is σ = 66169606464. Its totient is φ = 63811711920.

The previous prime is 64987539923. The next prime is 64987539971. The reversal of 64987539961 is 16993578946.

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 64987539961 - 2¹³ = 64987531769 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (67).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64987539971) 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, 1538590 + ... + 1580263.

It is an arithmetic number, because the mean of its divisors is an integer number (8271200808).

Almost surely, 2^64987539961 is an apocalyptic number.

It is an amenable number.

64987539961 is a deficient number, since it is larger than the sum of its proper divisors (1182066503).

64987539961 is a wasteful number, since it uses less digits than its factorization.

64987539961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3119231.

The product of its digits is 88179840, while the sum is 67.

The spelling of 64987539961 in words is "sixty-four billion, nine hundred eighty-seven million, five hundred thirty-nine thousand, nine hundred sixty-one".