15551399380 has 48 divisors (see below), whose sum is σ = 35972786304. Its totient is φ = 5600142720.

The previous prime is 15551399363. The next prime is 15551399399. The reversal of 15551399380 is 8399315551.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 320487 + ... + 365806.

It is an arithmetic number, because the mean of its divisors is an integer number (749433048).

Almost surely, 2^15551399380 is an apocalyptic number.

15551399380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15551399380 is an abundant number, since it is smaller than the sum of its proper divisors (20421386924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15551399380 is a wasteful number, since it uses less digits than its factorization.

15551399380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686416 (or 686414 counting only the distinct ones).

The product of its (nonzero) digits is 729000, while the sum is 49.

The spelling of 15551399380 in words is "fifteen billion, five hundred fifty-one million, three hundred ninety-nine thousand, three hundred eighty".