15545055551 has 4 divisors (see below), whose sum is σ = 15690336552. Its totient is φ = 15399774552.

The previous prime is 15545055529. The next prime is 15545055553. The reversal of 15545055551 is 15555054551.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15545055551 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15545055499 and 15545055508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15545055553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72640340 + ... + 72640553.

It is an arithmetic number, because the mean of its divisors is an integer number (3922584138).

Almost surely, 2^15545055551 is an apocalyptic number.

15545055551 is a deficient number, since it is larger than the sum of its proper divisors (145281001).

15545055551 is a wasteful number, since it uses less digits than its factorization.

15545055551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145281000.

The product of its (nonzero) digits is 312500, while the sum is 41.

The spelling of 15545055551 in words is "fifteen billion, five hundred forty-five million, fifty-five thousand, five hundred fifty-one".