1000000055551 has 20 divisors (see below), whose sum is σ = 1166914728072. Its totient is φ = 856909694256.

The previous prime is 1000000055539. The next prime is 1000000055557. The reversal of 1000000055551 is 1555500000001.

It is not a de Polignac number, because 1000000055551 - 2⁵ = 1000000055519 is a prime.

It is a super-2 number, since 2×1000000055551² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000000055557) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9076245 + ... + 9185761.

Almost surely, 2^{1000000055551} is an apocalyptic number.

1000000055551 is a deficient number, since it is larger than the sum of its proper divisors (166914672521).

1000000055551 is an frugal number, since it uses more digits than its factorization.

1000000055551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113348 (or 113327 counting only the distinct ones).

The product of its (nonzero) digits is 625, while the sum is 22.

Adding to 1000000055551 its reverse (1555500000001), we get a palindrome (2555500055552).

The spelling of 1000000055551 in words is "one trillion, fifty-five thousand, five hundred fifty-one".