66551651505157 has 32 divisors (see below), whose sum is σ = 84048287904000. Its totient is φ = 52362082108224.

The previous prime is 66551651505139. The next prime is 66551651505181. The reversal of 66551651505157 is 75150515615566.

It is a happy number.

It is not a de Polignac number, because 66551651505157 - 2¹¹ = 66551651503109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66551651505137) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40892458 + ... + 42488779.

It is an arithmetic number, because the mean of its divisors is an integer number (2626508997000).

Almost surely, 2^{66551651505157} is an apocalyptic number.

It is an amenable number.

66551651505157 is a deficient number, since it is larger than the sum of its proper divisors (17496636398843).

66551651505157 is a wasteful number, since it uses less digits than its factorization.

66551651505157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83381450 (or 83381436 counting only the distinct ones).

The product of its (nonzero) digits is 23625000, while the sum is 58.

The spelling of 66551651505157 in words is "sixty-six trillion, five hundred fifty-one billion, six hundred fifty-one million, five hundred five thousand, one hundred fifty-seven".