155401630778 has 16 divisors (see below), whose sum is σ = 233327793024. Its totient is φ = 77625737280.

The previous prime is 155401630777. The next prime is 155401630847. The reversal of 155401630778 is 877036104551.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (155401630777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11352098 + ... + 11365778.

It is an arithmetic number, because the mean of its divisors is an integer number (14582987064).

Almost surely, 2^155401630778 is an apocalyptic number.

155401630778 is a deficient number, since it is larger than the sum of its proper divisors (77926162246).

155401630778 is a wasteful number, since it uses less digits than its factorization.

155401630778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18757.

The product of its (nonzero) digits is 705600, while the sum is 47.

The spelling of 155401630778 in words is "one hundred fifty-five billion, four hundred one million, six hundred thirty thousand, seven hundred seventy-eight".