15540403455 has 24 divisors (see below), whose sum is σ = 26943248592. Its totient is φ = 8286200064.

The previous prime is 15540403453. The next prime is 15540403457. The reversal of 15540403455 is 55430404551.

It is an interprime number because it is at equal distance from previous prime (15540403453) and next prime (15540403457).

It is not a de Polignac number, because 15540403455 - 2¹ = 15540403453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15540403453) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 155352 + ... + 234978.

It is an arithmetic number, because the mean of its divisors is an integer number (1122635358).

Almost surely, 2^15540403455 is an apocalyptic number.

15540403455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

15540403455 is a deficient number, since it is larger than the sum of its proper divisors (11402845137).

15540403455 is a wasteful number, since it uses less digits than its factorization.

15540403455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83975 (or 83972 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 36.

The spelling of 15540403455 in words is "fifteen billion, five hundred forty million, four hundred three thousand, four hundred fifty-five".