64978598281 has 9 divisors (see below), whose sum is σ = 67932717069. Its totient is φ = 62147833836.

The previous prime is 64978598273. The next prime is 64978598369. The reversal of 64978598281 is 18289587946.

The square root of 64978598281 is 254909.

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

It is not a de Polignac number, because 64978598281 - 2³ = 64978598273 is a prime.

It is a super-2 number, since 2×64978598281² (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 (64978598981) 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, 5857366 + ... + 5868448.

Almost surely, 2^64978598281 is an apocalyptic number.

64978598281 is the 254909-th square number.

64978598281 is the 127455-th centered octagonal number.

It is an amenable number.

64978598281 is a deficient number, since it is larger than the sum of its proper divisors (2954118788).

64978598281 is an frugal number, since it uses more digits than its factorization.

64978598281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22212 (or 11106 counting only the distinct ones).

The product of its digits is 69672960, while the sum is 67.

The spelling of 64978598281 in words is "sixty-four billion, nine hundred seventy-eight million, five hundred ninety-eight thousand, two hundred eighty-one".