15242551561 has 8 divisors (see below), whose sum is σ = 15660461960. Its totient is φ = 14824954368.

The previous prime is 15242551537. The next prime is 15242551613. The reversal of 15242551561 is 16515524251.

It can be written as a sum of positive squares in 4 ways, for example, as 5588310025 + 9654241536 = 74755^2 + 98256^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15242551561 - 2³¹ = 13095067913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15242551561.

It is not an unprimeable number, because it can be changed into a prime (15242551361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22105 + ... + 175993.

It is an arithmetic number, because the mean of its divisors is an integer number (1957557745).

Almost surely, 2^15242551561 is an apocalyptic number.

It is an amenable number.

15242551561 is a deficient number, since it is larger than the sum of its proper divisors (417910399).

15242551561 is a wasteful number, since it uses less digits than its factorization.

15242551561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156603.

The product of its digits is 60000, while the sum is 37.

The spelling of 15242551561 in words is "fifteen billion, two hundred forty-two million, five hundred fifty-one thousand, five hundred sixty-one".