55551570 has 16 divisors (see below), whose sum is σ = 133323840. Its totient is φ = 14813744.

The previous prime is 55551569. The next prime is 55551583. The reversal of 55551570 is 7515555.

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, 925830 + ... + 925889.

It is an arithmetic number, because the mean of its divisors is an integer number (8332740).

Almost surely, 2^55551570 is an apocalyptic number.

55551570 is an abundant number, since it is smaller than the sum of its proper divisors (77772270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55551570 is a wasteful number, since it uses less digits than its factorization.

55551570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1851729.

The product of its (nonzero) digits is 21875, while the sum is 33.

The square root of 55551570 is about 7453.2925610095. The cubic root of 55551570 is about 381.5622893218.

It can be divided in two parts, 555 and 51570, that added together give a palindrome (52125).

The spelling of 55551570 in words is "fifty-five million, five hundred fifty-one thousand, five hundred seventy".