64542723631 has 8 divisors (see below), whose sum is σ = 64593320000. Its totient is φ = 64492152480.

The previous prime is 64542723593. The next prime is 64542723649. The reversal of 64542723631 is 13632724546.

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 64542723631 - 2¹⁹ = 64542199343 is a prime.

It is a super-2 number, since 2×64542723631² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64542729631) 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, 11050810 + ... + 11056648.

It is an arithmetic number, because the mean of its divisors is an integer number (8074165000).

Almost surely, 2^64542723631 is an apocalyptic number.

64542723631 is a deficient number, since it is larger than the sum of its proper divisors (50596369).

64542723631 is a wasteful number, since it uses less digits than its factorization.

64542723631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12609.

The product of its digits is 725760, while the sum is 43.

The spelling of 64542723631 in words is "sixty-four billion, five hundred forty-two million, seven hundred twenty-three thousand, six hundred thirty-one".