51677072221 has 4 divisors (see below), whose sum is σ = 53923901472. Its totient is φ = 49430242972.

The previous prime is 51677072201. The next prime is 51677072231. The reversal of 51677072221 is 12227077615.

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 not a de Polignac number, because 51677072221 - 2⁷ = 51677072093 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 (51677072201) 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, 1123414591 + ... + 1123414636.

It is an arithmetic number, because the mean of its divisors is an integer number (13480975368).

Almost surely, 2^51677072221 is an apocalyptic number.

It is an amenable number.

51677072221 is a deficient number, since it is larger than the sum of its proper divisors (2246829251).

51677072221 is a wasteful number, since it uses less digits than its factorization.

51677072221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2246829250.

The product of its (nonzero) digits is 82320, while the sum is 40.

The spelling of 51677072221 in words is "fifty-one billion, six hundred seventy-seven million, seventy-two thousand, two hundred twenty-one".