55393621577 has 16 divisors (see below), whose sum is σ = 65658000000. Its totient is φ = 46701864720.

The previous prime is 55393621541. The next prime is 55393621631. The reversal of 55393621577 is 77512639355.

It is a happy number.

It is not a de Polignac number, because 55393621577 - 2²² = 55389427273 is a prime.

It is a super-2 number, since 2×55393621577² (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 (55393621537) 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, 1302827 + ... + 1344672.

It is an arithmetic number, because the mean of its divisors is an integer number (4103625000).

Almost surely, 2^55393621577 is an apocalyptic number.

It is an amenable number.

55393621577 is a deficient number, since it is larger than the sum of its proper divisors (10264378423).

55393621577 is an equidigital number, since it uses as much as digits as its factorization.

55393621577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2647581 (or 2647567 counting only the distinct ones).

The product of its digits is 5953500, while the sum is 53.

The spelling of 55393621577 in words is "fifty-five billion, three hundred ninety-three million, six hundred twenty-one thousand, five hundred seventy-seven".