1621977023879 has 8 divisors (see below), whose sum is σ = 1623673986432. Its totient is φ = 1620280942560.

The previous prime is 1621977023861. The next prime is 1621977023917. The reversal of 1621977023879 is 9783207791261.

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 1621977023879 - 2¹² = 1621977019783 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 (1621977023279) 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, 3495449 + ... + 3932189.

It is an arithmetic number, because the mean of its divisors is an integer number (202959248304).

Almost surely, 2^{1621977023879} is an apocalyptic number.

1621977023879 is a deficient number, since it is larger than the sum of its proper divisors (1696962553).

1621977023879 is a wasteful number, since it uses less digits than its factorization.

1621977023879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440617.

The product of its (nonzero) digits is 16003008, while the sum is 62.

The spelling of 1621977023879 in words is "one trillion, six hundred twenty-one billion, nine hundred seventy-seven million, twenty-three thousand, eight hundred seventy-nine".