55402505 has 8 divisors (see below), whose sum is σ = 68280072. Its totient is φ = 43123968.

The previous prime is 55402483. The next prime is 55402511. The reversal of 55402505 is 50520455.

It can be written as a sum of positive squares in 4 ways, for example, as 29474041 + 25928464 = 5429^2 + 5092^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55402505 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149552 + ... + 149921.

It is an arithmetic number, because the mean of its divisors is an integer number (8535009).

Almost surely, 2^55402505 is an apocalyptic number.

It is an amenable number.

55402505 is a deficient number, since it is larger than the sum of its proper divisors (12877567).

55402505 is a wasteful number, since it uses less digits than its factorization.

55402505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299515.

The product of its (nonzero) digits is 5000, while the sum is 26.

The square root of 55402505 is about 7443.2859007296. The cubic root of 55402505 is about 381.2206936176.

The spelling of 55402505 in words is "fifty-five million, four hundred two thousand, five hundred five".