155661854 has 4 divisors (see below), whose sum is σ = 233492784. Its totient is φ = 77830926.

The previous prime is 155661853. The next prime is 155661887. The reversal of 155661854 is 458166551.

155661854 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 458166551 = 19 ⋅24114029.

It is a super-2 number, since 2×155661854² = 48461225581434632, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155661853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38915462 + ... + 38915465.

It is an arithmetic number, because the mean of its divisors is an integer number (58373196).

Almost surely, 2^155661854 is an apocalyptic number.

155661854 is a deficient number, since it is larger than the sum of its proper divisors (77830930).

155661854 is an equidigital number, since it uses as much as digits as its factorization.

155661854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77830929.

The product of its digits is 144000, while the sum is 41.

The square root of 155661854 is about 12476.4519796295. The cubic root of 155661854 is about 537.9320243208.

The spelling of 155661854 in words is "one hundred fifty-five million, six hundred sixty-one thousand, eight hundred fifty-four".