19950550155 has 16 divisors (see below), whose sum is σ = 35467644960. Its totient is φ = 10640293344.

The previous prime is 19950550153. The next prime is 19950550157. The reversal of 19950550155 is 55105505991.

19950550155 is a `hidden beast` number, since 1 + 9 + 95 + 0 + 5 + 501 + 55 = 666.

It is an interprime number because it is at equal distance from previous prime (19950550153) and next prime (19950550157).

It is not a de Polignac number, because 19950550155 - 2¹ = 19950550153 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 19950550155.

It is not an unprimeable number, because it can be changed into a prime (19950550153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73890792 + ... + 73891061.

It is an arithmetic number, because the mean of its divisors is an integer number (2216727810).

Almost surely, 2^19950550155 is an apocalyptic number.

19950550155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19950550155 is a deficient number, since it is larger than the sum of its proper divisors (15517094805).

19950550155 is a wasteful number, since it uses less digits than its factorization.

19950550155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147781867 (or 147781861 counting only the distinct ones).

The product of its (nonzero) digits is 253125, while the sum is 45.

The spelling of 19950550155 in words is "nineteen billion, nine hundred fifty million, five hundred fifty thousand, one hundred fifty-five".