13551961500 has 384 divisors, whose sum is σ = 54671984640. Its totient is φ = 2815776000.

The previous prime is 13551961463. The next prime is 13551961541. The reversal of 13551961500 is 516915531.

13551961500 is a `hidden beast` number, since 1 + 3 + 551 + 96 + 15 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1032982 + ... + 1046018.

It is an arithmetic number, because the mean of its divisors is an integer number (142374960).

Almost surely, 2^13551961500 is an apocalyptic number.

13551961500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13551961500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27335992320).

13551961500 is an abundant number, since it is smaller than the sum of its proper divisors (41120023140).

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

13551961500 is a wasteful number, since it uses less digits than its factorization.

13551961500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13083 (or 13065 counting only the distinct ones).

The product of its (nonzero) digits is 20250, while the sum is 36.

The spelling of 13551961500 in words is "thirteen billion, five hundred fifty-one million, nine hundred sixty-one thousand, five hundred".