921656505373 has 4 divisors (see below), whose sum is σ = 922230033120. Its totient is φ = 921082977628.

The previous prime is 921656505349. The next prime is 921656505383. The reversal of 921656505373 is 373505656129.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-921656505373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 921656505373.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921656505383) 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, 286761463 + ... + 286764676.

It is an arithmetic number, because the mean of its divisors is an integer number (230557508280).

Almost surely, 2^921656505373 is an apocalyptic number.

It is an amenable number.

921656505373 is a deficient number, since it is larger than the sum of its proper divisors (573527747).

921656505373 is a wasteful number, since it uses less digits than its factorization.

921656505373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573527746.

The product of its (nonzero) digits is 5103000, while the sum is 52.

The spelling of 921656505373 in words is "nine hundred twenty-one billion, six hundred fifty-six million, five hundred five thousand, three hundred seventy-three".