77194720021 has 8 divisors (see below), whose sum is σ = 79168272480. Its totient is φ = 75229273392.

The previous prime is 77194719989. The next prime is 77194720027. The reversal of 77194720021 is 12002749177.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77194720021 - 2⁵ = 77194719989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77194720027) 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, 2007166 + ... + 2045263.

It is an arithmetic number, because the mean of its divisors is an integer number (9896034060).

Almost surely, 2^77194720021 is an apocalyptic number.

It is an amenable number.

77194720021 is a deficient number, since it is larger than the sum of its proper divisors (1973552459).

77194720021 is a wasteful number, since it uses less digits than its factorization.

77194720021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4052915.

The product of its (nonzero) digits is 49392, while the sum is 40.

The spelling of 77194720021 in words is "seventy-seven billion, one hundred ninety-four million, seven hundred twenty thousand, twenty-one".