155531640435 has 64 divisors (see below), whose sum is σ = 262942848000. Its totient is φ = 78391595520.

The previous prime is 155531640367. The next prime is 155531640443. The reversal of 155531640435 is 534046135551.

It is a happy number.

It is not a de Polignac number, because 155531640435 - 2⁷ = 155531640307 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4274901 + ... + 4311129.

It is an arithmetic number, because the mean of its divisors is an integer number (4108482000).

Almost surely, 2^155531640435 is an apocalyptic number.

155531640435 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

155531640435 is a deficient number, since it is larger than the sum of its proper divisors (107411207565).

155531640435 is a wasteful number, since it uses less digits than its factorization.

155531640435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36476.

The product of its (nonzero) digits is 540000, while the sum is 42.

Adding to 155531640435 its reverse (534046135551), we get a palindrome (689577775986).

The spelling of 155531640435 in words is "one hundred fifty-five billion, five hundred thirty-one million, six hundred forty thousand, four hundred thirty-five".