15550531461 has 12 divisors (see below), whose sum is σ = 22473041292. Its totient is φ = 10361869056.

The previous prime is 15550531439. The next prime is 15550531471. The reversal of 15550531461 is 16413505551.

15550531461 is a `hidden beast` number, since 1 + 5 + 5 + 505 + 3 + 146 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9026900100 + 6523631361 = 95010^2 + 80769^2 .

It is not a de Polignac number, because 15550531461 - 2³³ = 6960596869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15550531471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 410166 + ... + 446471.

It is an arithmetic number, because the mean of its divisors is an integer number (1872753441).

Almost surely, 2^15550531461 is an apocalyptic number.

It is an amenable number.

15550531461 is a deficient number, since it is larger than the sum of its proper divisors (6922509831).

15550531461 is a wasteful number, since it uses less digits than its factorization.

15550531461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858660 (or 858657 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

It can be divided in two parts, 155505 and 31461, that added together give a triangular number (186966 = T₆₁₁).

The spelling of 15550531461 in words is "fifteen billion, five hundred fifty million, five hundred thirty-one thousand, four hundred sixty-one".