977220817819 has 4 divisors (see below), whose sum is σ = 988994562696. Its totient is φ = 965447072944.

The previous prime is 977220817787. The next prime is 977220817841. The reversal of 977220817819 is 918718022779.

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 977220817819 - 2⁵ = 977220817787 is a prime.

It is a super-2 number, since 2×977220817819² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (977220817879) 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, 5886872314 + ... + 5886872479.

It is an arithmetic number, because the mean of its divisors is an integer number (247248640674).

Almost surely, 2^977220817819 is an apocalyptic number.

977220817819 is a deficient number, since it is larger than the sum of its proper divisors (11773744877).

977220817819 is a wasteful number, since it uses less digits than its factorization.

977220817819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11773744876.

The product of its (nonzero) digits is 7112448, while the sum is 61.

The spelling of 977220817819 in words is "nine hundred seventy-seven billion, two hundred twenty million, eight hundred seventeen thousand, eight hundred nineteen".