64687029121 has 32 divisors (see below), whose sum is σ = 79541038080. Its totient is φ = 51764961600.

The previous prime is 64687029109. The next prime is 64687029241. The reversal of 64687029121 is 12192078646.

It is not a de Polignac number, because 64687029121 - 2³¹ = 62539545473 is a prime.

It is a super-2 number, since 2×64687029121² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64687029821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1058950 + ... + 1118368.

It is an arithmetic number, because the mean of its divisors is an integer number (2485657440).

Almost surely, 2^64687029121 is an apocalyptic number.

It is an amenable number.

64687029121 is a deficient number, since it is larger than the sum of its proper divisors (14854008959).

64687029121 is a wasteful number, since it uses less digits than its factorization.

64687029121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59797.

The product of its (nonzero) digits is 290304, while the sum is 46.

The spelling of 64687029121 in words is "sixty-four billion, six hundred eighty-seven million, twenty-nine thousand, one hundred twenty-one".