55405957 has 4 divisors (see below), whose sum is σ = 58322080. Its totient is φ = 52489836.

The previous prime is 55405949. The next prime is 55405963. The reversal of 55405957 is 75950455.

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 55405957 - 2³ = 55405949 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 (55405157) 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, 1458033 + ... + 1458070.

It is an arithmetic number, because the mean of its divisors is an integer number (14580520).

Almost surely, 2^55405957 is an apocalyptic number.

It is an amenable number.

55405957 is a deficient number, since it is larger than the sum of its proper divisors (2916123).

55405957 is a wasteful number, since it uses less digits than its factorization.

55405957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2916122.

The product of its (nonzero) digits is 157500, while the sum is 40.

The square root of 55405957 is about 7443.5177839513. The cubic root of 55405957 is about 381.2286111086.

The spelling of 55405957 in words is "fifty-five million, four hundred five thousand, nine hundred fifty-seven".