15554561091 has 8 divisors (see below), whose sum is σ = 21299939664. Its totient is φ = 10089444960.

The previous prime is 15554561081. The next prime is 15554561101. The reversal of 15554561091 is 19016545551.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (15554561081) and next prime (15554561101).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 15554561091 - 2⁵ = 15554561059 is a prime.

It is a super-2 number, since 2×15554561091² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15554561021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70065480 + ... + 70065701.

It is an arithmetic number, because the mean of its divisors is an integer number (2662492458).

Almost surely, 2^15554561091 is an apocalyptic number.

15554561091 is a deficient number, since it is larger than the sum of its proper divisors (5745378573).

15554561091 is a wasteful number, since it uses less digits than its factorization.

15554561091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140131221.

The product of its (nonzero) digits is 135000, while the sum is 42.

The spelling of 15554561091 in words is "fifteen billion, five hundred fifty-four million, five hundred sixty-one thousand, ninety-one".