15554554997 has 4 divisors (see below), whose sum is σ = 15677031936. Its totient is φ = 15432078060.

The previous prime is 15554554987. The next prime is 15554554999. The reversal of 15554554997 is 79945545551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 15554554997 - 2¹² = 15554550901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15554554999) 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, 61238279 + ... + 61238532.

It is an arithmetic number, because the mean of its divisors is an integer number (3919257984).

Almost surely, 2^15554554997 is an apocalyptic number.

It is an amenable number.

15554554997 is a deficient number, since it is larger than the sum of its proper divisors (122476939).

15554554997 is a wasteful number, since it uses less digits than its factorization.

15554554997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122476938.

The product of its digits is 28350000, while the sum is 59.

It can be divided in two parts, 15554554 and 997, that added together give a palindrome (15555551).

The spelling of 15554554997 in words is "fifteen billion, five hundred fifty-four million, five hundred fifty-four thousand, nine hundred ninety-seven".