155214661 has 4 divisors (see below), whose sum is σ = 177388192. Its totient is φ = 133041132.

The previous prime is 155214637. The next prime is 155214671. The reversal of 155214661 is 166412551.

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 not a de Polignac number, because 155214661 - 2¹¹ = 155212613 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 (155214601) 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, 11086755 + ... + 11086768.

It is an arithmetic number, because the mean of its divisors is an integer number (44347048).

Almost surely, 2^155214661 is an apocalyptic number.

It is an amenable number.

155214661 is a deficient number, since it is larger than the sum of its proper divisors (22173531).

155214661 is an equidigital number, since it uses as much as digits as its factorization.

155214661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22173530.

The product of its digits is 7200, while the sum is 31.

The square root of 155214661 is about 12458.5176084476. The cubic root of 155214661 is about 537.4163977418.

The spelling of 155214661 in words is "one hundred fifty-five million, two hundred fourteen thousand, six hundred sixty-one".