55401550 has 24 divisors (see below), whose sum is σ = 104118336. Its totient is φ = 21930240.

The previous prime is 55401547. The next prime is 55401553. The reversal of 55401550 is 5510455.

It is an interprime number because it is at equal distance from previous prime (55401547) and next prime (55401553).

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55401553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 862 + ... + 10561.

It is an arithmetic number, because the mean of its divisors is an integer number (4338264).

Almost surely, 2^55401550 is an apocalyptic number.

55401550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

55401550 is a deficient number, since it is larger than the sum of its proper divisors (48716786).

55401550 is a wasteful number, since it uses less digits than its factorization.

55401550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11532 (or 11527 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 55401550 is about 7443.2217486785. The cubic root of 55401550 is about 381.2185031760.

The spelling of 55401550 in words is "fifty-five million, four hundred one thousand, five hundred fifty".