66902947918 has 16 divisors (see below), whose sum is σ = 102902248656. Its totient is φ = 32611904640.

The previous prime is 66902947861. The next prime is 66902947927. The reversal of 66902947918 is 81974920966.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2412696 + ... + 2440267.

It is an arithmetic number, because the mean of its divisors is an integer number (6431390541).

Almost surely, 2^66902947918 is an apocalyptic number.

66902947918 is a deficient number, since it is larger than the sum of its proper divisors (35999300738).

66902947918 is a wasteful number, since it uses less digits than its factorization.

66902947918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4853139.

The product of its (nonzero) digits is 11757312, while the sum is 61.

The spelling of 66902947918 in words is "sixty-six billion, nine hundred two million, nine hundred forty-seven thousand, nine hundred eighteen".