15540451051 has 4 divisors (see below), whose sum is σ = 15541951600. Its totient is φ = 15538950504.

The previous prime is 15540451039. The next prime is 15540451079. The reversal of 15540451051 is 15015404551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15015404551 = 7 ⋅2145057793.

It is a cyclic number.

It is not a de Polignac number, because 15540451051 - 2⁵ = 15540451019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15540451651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 734631 + ... + 755488.

It is an arithmetic number, because the mean of its divisors is an integer number (3885487900).

Almost surely, 2^15540451051 is an apocalyptic number.

15540451051 is a deficient number, since it is larger than the sum of its proper divisors (1500549).

15540451051 is a wasteful number, since it uses less digits than its factorization.

15540451051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500548.

The product of its (nonzero) digits is 10000, while the sum is 31.

The spelling of 15540451051 in words is "fifteen billion, five hundred forty million, four hundred fifty-one thousand, fifty-one".