77221172025261 has 36 divisors (see below), whose sum is σ = 127144556049056. Its totient is φ = 46800710300520.

The previous prime is 77221172025211. The next prime is 77221172025299. The reversal of 77221172025261 is 16252027112277.

77221172025261 is a `hidden beast` number, since 7 + 7 + 2 + 2 + 117 + 2 + 0 + 2 + 526 + 1 = 666.

It is not a de Polignac number, because 77221172025261 - 2²⁵ = 77221138470829 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77221172025211) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1313121841 + ... + 1313180646.

Almost surely, 2^{77221172025261} is an apocalyptic number.

It is an amenable number.

77221172025261 is a deficient number, since it is larger than the sum of its proper divisors (49923384023795).

77221172025261 is a wasteful number, since it uses less digits than its factorization.

77221172025261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2626302524 (or 2626302501 counting only the distinct ones).

The product of its (nonzero) digits is 329280, while the sum is 45.

The spelling of 77221172025261 in words is "seventy-seven trillion, two hundred twenty-one billion, one hundred seventy-two million, twenty-five thousand, two hundred sixty-one".