66551651505156 has 48 divisors (see below), whose sum is σ = 155456129949120. Its totient is φ = 22159750609920.

The previous prime is 66551651505139. The next prime is 66551651505181. The reversal of 66551651505156 is 65150515615566.

It is a junction number, because it is equal to n+sod(n) for n = 66551651505096 and 66551651505105.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 451770360 + ... + 451917648.

It is an arithmetic number, because the mean of its divisors is an integer number (3238669373940).

Almost surely, 2^{66551651505156} is an apocalyptic number.

It is an amenable number.

66551651505156 is an abundant number, since it is smaller than the sum of its proper divisors (88904478443964).

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

66551651505156 is a wasteful number, since it uses less digits than its factorization.

66551651505156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188004 (or 188002 counting only the distinct ones).

The product of its (nonzero) digits is 20250000, while the sum is 57.

The spelling of 66551651505156 in words is "sixty-six trillion, five hundred fifty-one billion, six hundred fifty-one million, five hundred five thousand, one hundred fifty-six".