11898991545 has 16 divisors (see below), whose sum is σ = 21758156160. Its totient is φ = 5439538944.

The previous prime is 11898991541. The next prime is 11898991549. The reversal of 11898991545 is 54519989811.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (11898991541) and next prime (11898991549).

It is not a de Polignac number, because 11898991545 - 2² = 11898991541 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11898991541) 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, 56661760 + ... + 56661969.

It is an arithmetic number, because the mean of its divisors is an integer number (1359884760).

Almost surely, 2^11898991545 is an apocalyptic number.

11898991545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11898991545 is a deficient number, since it is larger than the sum of its proper divisors (9859164615).

11898991545 is a wasteful number, since it uses less digits than its factorization.

11898991545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113323744.

The product of its digits is 4665600, while the sum is 60.

The spelling of 11898991545 in words is "eleven billion, eight hundred ninety-eight million, nine hundred ninety-one thousand, five hundred forty-five".