155621635061 has 4 divisors (see below), whose sum is σ = 155624745312. Its totient is φ = 155618524812.

The previous prime is 155621635051. The next prime is 155621635067. The reversal of 155621635061 is 160536126551.

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: 160536126551 = 179 ⋅896849869.

It is a cyclic number.

It is not a de Polignac number, because 155621635061 - 2⁶ = 155621634997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155621635067) 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, 1478825 + ... + 1580558.

It is an arithmetic number, because the mean of its divisors is an integer number (38906186328).

Almost surely, 2^155621635061 is an apocalyptic number.

It is an amenable number.

155621635061 is a deficient number, since it is larger than the sum of its proper divisors (3110251).

155621635061 is an equidigital number, since it uses as much as digits as its factorization.

155621635061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3110250.

The product of its (nonzero) digits is 162000, while the sum is 41.

The spelling of 155621635061 in words is "one hundred fifty-five billion, six hundred twenty-one million, six hundred thirty-five thousand, sixty-one".