55821631579 has 24 divisors (see below), whose sum is σ = 68772665088. Its totient is φ = 45021070080.

The previous prime is 55821631561. The next prime is 55821631637. The reversal of 55821631579 is 97513612855.

It is a happy number.

It is not a de Polignac number, because 55821631579 - 2⁹ = 55821631067 is a prime.

It is a super-2 number, since 2×55821631579² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55821631519) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5036614 + ... + 5047684.

It is an arithmetic number, because the mean of its divisors is an integer number (2865527712).

Almost surely, 2^55821631579 is an apocalyptic number.

55821631579 is a deficient number, since it is larger than the sum of its proper divisors (12951033509).

55821631579 is a wasteful number, since it uses less digits than its factorization.

55821631579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17155 (or 17148 counting only the distinct ones).

The product of its digits is 2268000, while the sum is 52.

The spelling of 55821631579 in words is "fifty-five billion, eight hundred twenty-one million, six hundred thirty-one thousand, five hundred seventy-nine".