1622856879397 has 4 divisors (see below), whose sum is σ = 1747692023980. Its totient is φ = 1498021734816.

The previous prime is 1622856879349. The next prime is 1622856879433. The reversal of 1622856879397 is 7939786582261.

It is a Cunningham number, because it is equal to 1273914²+1.

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

It can be written as a sum of positive squares in 2 ways, for example, as 240066681156 + 1382790198241 = 489966^2 + 1175921^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1622856879397 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 (1622856879097) 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, 62417572272 + ... + 62417572297.

It is an arithmetic number, because the mean of its divisors is an integer number (436923005995).

Almost surely, 2^{1622856879397} is an apocalyptic number.

It is an amenable number.

1622856879397 is a deficient number, since it is larger than the sum of its proper divisors (124835144583).

1622856879397 is a wasteful number, since it uses less digits than its factorization.

1622856879397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124835144582.

The product of its digits is 548674560, while the sum is 73.

The spelling of 1622856879397 in words is "one trillion, six hundred twenty-two billion, eight hundred fifty-six million, eight hundred seventy-nine thousand, three hundred ninety-seven".