55251641621 has 8 divisors (see below), whose sum is σ = 61556955264. Its totient is φ = 49160067520.

The previous prime is 55251641617. The next prime is 55251641737. The reversal of 55251641621 is 12614615255.

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 55251641621 - 2² = 55251641617 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 (55251641021) 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, 53434340 + ... + 53435373.

It is an arithmetic number, because the mean of its divisors is an integer number (7694619408).

Almost surely, 2^55251641621 is an apocalyptic number.

It is an amenable number.

55251641621 is a deficient number, since it is larger than the sum of its proper divisors (6305313643).

55251641621 is a wasteful number, since it uses less digits than its factorization.

55251641621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106869771.

The product of its digits is 72000, while the sum is 38.

The spelling of 55251641621 in words is "fifty-five billion, two hundred fifty-one million, six hundred forty-one thousand, six hundred twenty-one".