51505155666 has 16 divisors (see below), whose sum is σ = 114455901600. Its totient is φ = 17168385204.

The previous prime is 51505155661. The next prime is 51505155677. The reversal of 51505155666 is 66655150515.

It is not an unprimeable number, because it can be changed into a prime (51505155661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 476899536 + ... + 476899643.

It is an arithmetic number, because the mean of its divisors is an integer number (7153493850).

Almost surely, 2^51505155666 is an apocalyptic number.

51505155666 is an abundant number, since it is smaller than the sum of its proper divisors (62950745934).

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

51505155666 is a wasteful number, since it uses less digits than its factorization.

51505155666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953799190 (or 953799184 counting only the distinct ones).

The product of its (nonzero) digits is 675000, while the sum is 45.

The spelling of 51505155666 in words is "fifty-one billion, five hundred five million, one hundred fifty-five thousand, six hundred sixty-six".