51161214621 has 16 divisors (see below), whose sum is σ = 78793743168. Its totient is φ = 29182867200.

The previous prime is 51161214617. The next prime is 51161214631. The reversal of 51161214621 is 12641216115.

It is not a de Polignac number, because 51161214621 - 2² = 51161214617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51161214631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45597670 + ... + 45598791.

It is an arithmetic number, because the mean of its divisors is an integer number (4924608948).

Almost surely, 2^51161214621 is an apocalyptic number.

51161214621 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

51161214621 is a deficient number, since it is larger than the sum of its proper divisors (27632528547).

51161214621 is a wasteful number, since it uses less digits than its factorization.

51161214621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91196492.

The product of its digits is 2880, while the sum is 30.

The spelling of 51161214621 in words is "fifty-one billion, one hundred sixty-one million, two hundred fourteen thousand, six hundred twenty-one".