1155373299509 has 32 divisors (see below), whose sum is σ = 1359810885888. Its totient is φ = 967796352000.

The previous prime is 1155373299503. The next prime is 1155373299511. The reversal of 1155373299509 is 9059923735511.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1155373299509 - 2³² = 1151078332213 is a prime.

It is a super-2 number, since 2×1155373299509² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155373299503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 244728269 + ... + 244732989.

It is an arithmetic number, because the mean of its divisors is an integer number (42494090184).

Almost surely, 2^{1155373299509} is an apocalyptic number.

It is an amenable number.

1155373299509 is a deficient number, since it is larger than the sum of its proper divisors (204437586379).

1155373299509 is a wasteful number, since it uses less digits than its factorization.

1155373299509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7469.

The product of its (nonzero) digits is 11481750, while the sum is 59.

The spelling of 1155373299509 in words is "one trillion, one hundred fifty-five billion, three hundred seventy-three million, two hundred ninety-nine thousand, five hundred nine".