65999970 has 24 divisors (see below), whose sum is σ = 171600156. Its totient is φ = 17599968.

The previous prime is 65999951. The next prime is 65999993. The reversal of 65999970 is 7999956.

It can be written as a sum of positive squares in 2 ways, for example, as 57653649 + 8346321 = 7593^2 + 2889^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 366577 + ... + 366756.

Almost surely, 2^65999970 is an apocalyptic number.

65999970 is an abundant number, since it is smaller than the sum of its proper divisors (105600186).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65999970 is a wasteful number, since it uses less digits than its factorization.

65999970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 733346 (or 733343 counting only the distinct ones).

The product of its (nonzero) digits is 1377810, while the sum is 54.

The square root of 65999970 is about 8124.0365582634. The cubic root of 65999970 is about 404.1239408313.

The spelling of 65999970 in words is "sixty-five million, nine hundred ninety-nine thousand, nine hundred seventy".