97721412779 has 4 divisors (see below), whose sum is σ = 97871063376. Its totient is φ = 97571762184.

The previous prime is 97721412757. The next prime is 97721412793.

97721412779 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 97721412779 - 2²⁴ = 97704635563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97721412739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74824319 + ... + 74825624.

It is an arithmetic number, because the mean of its divisors is an integer number (24467765844).

Almost surely, 2^97721412779 is an apocalyptic number.

97721412779 is a deficient number, since it is larger than the sum of its proper divisors (149650597).

97721412779 is a wasteful number, since it uses less digits than its factorization.

97721412779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149650596.

The product of its digits is 3111696, while the sum is 56.

The spelling of 97721412779 in words is "ninety-seven billion, seven hundred twenty-one million, four hundred twelve thousand, seven hundred seventy-nine".