164561251077 has 32 divisors (see below), whose sum is σ = 250413081600. Its totient is φ = 106748527536.

The previous prime is 164561251067. The next prime is 164561251079. The reversal of 164561251077 is 770152165461.

164561251077 is a `hidden beast` number, since 1 + 6 + 4 + 5 + 61 + 2 + 510 + 77 = 666.

It is not a de Polignac number, because 164561251077 - 2¹⁶ = 164561185541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164561251079) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 35874 + ... + 574812.

It is an arithmetic number, because the mean of its divisors is an integer number (7825408800).

Almost surely, 2^164561251077 is an apocalyptic number.

It is an amenable number.

164561251077 is a deficient number, since it is larger than the sum of its proper divisors (85851830523).

164561251077 is a wasteful number, since it uses less digits than its factorization.

164561251077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539254 (or 539248 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 45.

The spelling of 164561251077 in words is "one hundred sixty-four billion, five hundred sixty-one million, two hundred fifty-one thousand, seventy-seven".