15601550491 has 2 divisors, whose sum is σ = 15601550492. Its totient is φ = 15601550490.

The previous prime is 15601550479. The next prime is 15601550507. The reversal of 15601550491 is 19405510651.

It is a weak prime.

It is an emirp because it is prime and its reverse (19405510651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15601550491 - 2¹⁷ = 15601419419 is a prime.

It is a super-3 number, since 3×15601550491³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15601550491.

It is not a weakly prime, because it can be changed into another prime (15601550401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7800775245 + 7800775246.

It is an arithmetic number, because the mean of its divisors is an integer number (7800775246).

Almost surely, 2^15601550491 is an apocalyptic number.

15601550491 is a deficient number, since it is larger than the sum of its proper divisors (1).

15601550491 is an equidigital number, since it uses as much as digits as its factorization.

15601550491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27000, while the sum is 37.

The spelling of 15601550491 in words is "fifteen billion, six hundred one million, five hundred fifty thousand, four hundred ninety-one".