155194491551 has 16 divisors (see below), whose sum is σ = 174791126016. Its totient is φ = 136513920000.

The previous prime is 155194491499. The next prime is 155194491553.

155194491551 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 155194491551 - 2¹⁰ = 155194490527 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155194491551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155194491553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2468831 + ... + 2530911.

It is an arithmetic number, because the mean of its divisors is an integer number (10924445376).

Almost surely, 2^155194491551 is an apocalyptic number.

155194491551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

155194491551 is a deficient number, since it is larger than the sum of its proper divisors (19596634465).

155194491551 is a wasteful number, since it uses less digits than its factorization.

155194491551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69454.

The product of its digits is 810000, while the sum is 50.

The spelling of 155194491551 in words is "one hundred fifty-five billion, one hundred ninety-four million, four hundred ninety-one thousand, five hundred fifty-one".