64774831081 has 9 divisors (see below), whose sum is σ = 65279842173. Its totient is φ = 64273702860.

The previous prime is 64774830983. The next prime is 64774831127. The reversal of 64774831081 is 18013847746.

The square root of 64774831081 is 254509.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 64774831081 - 2⁹ = 64774830569 is a prime.

It is a super-2 number, since 2×64774831081² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64774891081) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 35375836 + ... + 35377666.

It is an arithmetic number, because the mean of its divisors is an integer number (7253315797).

Almost surely, 2^64774831081 is an apocalyptic number.

64774831081 is the 254509-th square number.

64774831081 is the 127255-th centered octagonal number.

It is an amenable number.

64774831081 is a deficient number, since it is larger than the sum of its proper divisors (505011092).

64774831081 is an frugal number, since it uses more digits than its factorization.

64774831081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3940 (or 1970 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 49.

Multiplying 64774831081 by its sum of digits (49), we get a square (3173966722969 = 1781563²).

The spelling of 64774831081 in words is "sixty-four billion, seven hundred seventy-four million, eight hundred thirty-one thousand, eighty-one".