155634630661 has 4 divisors (see below), whose sum is σ = 155659297824. Its totient is φ = 155609963500.

The previous prime is 155634630643. The next prime is 155634630673. The reversal of 155634630661 is 166036436551.

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.

It is a cyclic number.

It is not a de Polignac number, because 155634630661 - 2⁷ = 155634630533 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 (155634630601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12324115 + ... + 12336736.

It is an arithmetic number, because the mean of its divisors is an integer number (38914824456).

Almost surely, 2^155634630661 is an apocalyptic number.

It is an amenable number.

155634630661 is a deficient number, since it is larger than the sum of its proper divisors (24667163).

155634630661 is an equidigital number, since it uses as much as digits as its factorization.

155634630661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24667162.

The product of its (nonzero) digits is 1166400, while the sum is 46.

The spelling of 155634630661 in words is "one hundred fifty-five billion, six hundred thirty-four million, six hundred thirty thousand, six hundred sixty-one".