15251661345 has 8 divisors (see below), whose sum is σ = 24402658176. Its totient is φ = 8134219376.

The previous prime is 15251661343. The next prime is 15251661371. The reversal of 15251661345 is 54316615251.

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 15251661345 - 2¹ = 15251661343 is a prime.

It is a super-2 number, since 2×15251661345² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15251661343) 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, 508388697 + ... + 508388726.

It is an arithmetic number, because the mean of its divisors is an integer number (3050332272).

Almost surely, 2^15251661345 is an apocalyptic number.

15251661345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15251661345 is a deficient number, since it is larger than the sum of its proper divisors (9150996831).

15251661345 is a wasteful number, since it uses less digits than its factorization.

15251661345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016777431.

The product of its digits is 108000, while the sum is 39.

The spelling of 15251661345 in words is "fifteen billion, two hundred fifty-one million, six hundred sixty-one thousand, three hundred forty-five".