155315402505 has 48 divisors (see below), whose sum is σ = 280507840704. Its totient is φ = 82442162880.

The previous prime is 155315402503. The next prime is 155315402507. The reversal of 155315402505 is 505204513551.

155315402505 is a `hidden beast` number, since 1 + 55 + 315 + 40 + 250 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (155315402503) and next prime (155315402507).

It is not a de Polignac number, because 155315402505 - 2¹ = 155315402503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155315402505.

It is not an unprimeable number, because it can be changed into a prime (155315402503) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 46554 + ... + 559283.

It is an arithmetic number, because the mean of its divisors is an integer number (5843913348).

Almost surely, 2^155315402505 is an apocalyptic number.

155315402505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155315402505 is a deficient number, since it is larger than the sum of its proper divisors (125192438199).

155315402505 is an equidigital number, since it uses as much as digits as its factorization.

155315402505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606068 (or 606056 counting only the distinct ones).

The product of its (nonzero) digits is 75000, while the sum is 36.

The spelling of 155315402505 in words is "one hundred fifty-five billion, three hundred fifteen million, four hundred two thousand, five hundred five".