155521623451 has 2 divisors, whose sum is σ = 155521623452. Its totient is φ = 155521623450.

The previous prime is 155521623449. The next prime is 155521623479. The reversal of 155521623451 is 154326125551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155521623451 - 2¹ = 155521623449 is a prime.

Together with 155521623449, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (155521623401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77760811725 + 77760811726.

It is an arithmetic number, because the mean of its divisors is an integer number (77760811726).

Almost surely, 2^155521623451 is an apocalyptic number.

155521623451 is a deficient number, since it is larger than the sum of its proper divisors (1).

155521623451 is an equidigital number, since it uses as much as digits as its factorization.

155521623451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 180000, while the sum is 40.

The spelling of 155521623451 in words is "one hundred fifty-five billion, five hundred twenty-one million, six hundred twenty-three thousand, four hundred fifty-one".