155981757829 has 4 divisors (see below), whose sum is σ = 156014265600. Its totient is φ = 155949250060.

The previous prime is 155981757773. The next prime is 155981757853. The reversal of 155981757829 is 928757189551.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 928757189551 = 388757 ⋅2389043.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155981757829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155981707829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16246687 + ... + 16256284.

It is an arithmetic number, because the mean of its divisors is an integer number (39003566400).

Almost surely, 2^155981757829 is an apocalyptic number.

It is an amenable number.

155981757829 is a deficient number, since it is larger than the sum of its proper divisors (32507771).

155981757829 is an equidigital number, since it uses as much as digits as its factorization.

155981757829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32507770.

The product of its digits is 63504000, while the sum is 67.

The spelling of 155981757829 in words is "one hundred fifty-five billion, nine hundred eighty-one million, seven hundred fifty-seven thousand, eight hundred twenty-nine".