77622643221 has 8 divisors (see below), whose sum is σ = 103850090400. Its totient is φ = 51571812432.

The previous prime is 77622643211. The next prime is 77622643237. The reversal of 77622643221 is 12234622677.

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

It is not a de Polignac number, because 77622643221 - 2²² = 77618448917 is a prime.

It is a super-2 number, since 2×77622643221² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77622643211) 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, 44153071 + ... + 44154828.

It is an arithmetic number, because the mean of its divisors is an integer number (12981261300).

Almost surely, 2^77622643221 is an apocalyptic number.

It is an amenable number.

77622643221 is a deficient number, since it is larger than the sum of its proper divisors (26227447179).

77622643221 is a wasteful number, since it uses less digits than its factorization.

77622643221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88308195.

The product of its digits is 338688, while the sum is 42.

The spelling of 77622643221 in words is "seventy-seven billion, six hundred twenty-two million, six hundred forty-three thousand, two hundred twenty-one".