15248778861 has 16 divisors (see below), whose sum is σ = 20712283200. Its totient is φ = 9976163328.

The previous prime is 15248778859. The next prime is 15248778863. The reversal of 15248778861 is 16887784251.

It is an interprime number because it is at equal distance from previous prime (15248778859) and next prime (15248778863).

It is not a de Polignac number, because 15248778861 - 2¹ = 15248778859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15248778863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27475 + ... + 176783.

It is an arithmetic number, because the mean of its divisors is an integer number (1294517700).

Almost surely, 2^15248778861 is an apocalyptic number.

It is an amenable number.

15248778861 is a deficient number, since it is larger than the sum of its proper divisors (5463504339).

15248778861 is a wasteful number, since it uses less digits than its factorization.

15248778861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149948.

The product of its digits is 6021120, while the sum is 57.

The spelling of 15248778861 in words is "fifteen billion, two hundred forty-eight million, seven hundred seventy-eight thousand, eight hundred sixty-one".