66210016015 has 128 divisors (see below), whose sum is σ = 101292871680. Its totient is φ = 41165245440.

The previous prime is 66210016001. The next prime is 66210016031. The reversal of 66210016015 is 51061001266.

It is not a de Polignac number, because 66210016015 - 2²³ = 66201627407 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 77257467 + ... + 77258323.

It is an arithmetic number, because the mean of its divisors is an integer number (791350560).

Almost surely, 2^66210016015 is an apocalyptic number.

66210016015 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66210016015 is a deficient number, since it is larger than the sum of its proper divisors (35082855665).

66210016015 is a wasteful number, since it uses less digits than its factorization.

66210016015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 974 (or 952 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The spelling of 66210016015 in words is "sixty-six billion, two hundred ten million, sixteen thousand, fifteen".