155711468249 has 4 divisors (see below), whose sum is σ = 159509308980. Its totient is φ = 151913627520.

The previous prime is 155711468201. The next prime is 155711468267. The reversal of 155711468249 is 942864117551.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3076699024 + 152634769225 = 55468^2 + 390685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155711468249 is a prime.

It is a super-2 number, since 2×155711468249² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155711468249.

It is not an unprimeable number, because it can be changed into a prime (155711468299) 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, 1898920304 + ... + 1898920385.

It is an arithmetic number, because the mean of its divisors is an integer number (39877327245).

Almost surely, 2^155711468249 is an apocalyptic number.

It is an amenable number.

155711468249 is a deficient number, since it is larger than the sum of its proper divisors (3797840731).

155711468249 is an equidigital number, since it uses as much as digits as its factorization.

155711468249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3797840730.

The product of its digits is 2419200, while the sum is 53.

The spelling of 155711468249 in words is "one hundred fifty-five billion, seven hundred eleven million, four hundred sixty-eight thousand, two hundred forty-nine".