55661101551 has 24 divisors (see below), whose sum is σ = 87715854720. Its totient is φ = 33731134800.

The previous prime is 55661101547. The next prime is 55661101583. The reversal of 55661101551 is 15510116655.

It is a happy number.

It is not a de Polignac number, because 55661101551 - 2² = 55661101547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55661101511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2066710 + ... + 2093468.

It is an arithmetic number, because the mean of its divisors is an integer number (3654827280).

Almost surely, 2^55661101551 is an apocalyptic number.

55661101551 is a deficient number, since it is larger than the sum of its proper divisors (32054753169).

55661101551 is a wasteful number, since it uses less digits than its factorization.

55661101551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47787 (or 47784 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 36.

The spelling of 55661101551 in words is "fifty-five billion, six hundred sixty-one million, one hundred one thousand, five hundred fifty-one".