19950749550 has 144 divisors (see below), whose sum is σ = 58512504960. Its totient is φ = 5040131040.

The previous prime is 19950749509. The next prime is 19950749563. The reversal of 19950749550 is 5594705991.

19950749550 is a `hidden beast` number, since 1 + 99 + 507 + 49 + 5 + 5 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 187639 + ... + 274061.

It is an arithmetic number, because the mean of its divisors is an integer number (406336840).

Almost surely, 2^19950749550 is an apocalyptic number.

19950749550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19950749550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29256252480).

19950749550 is an abundant number, since it is smaller than the sum of its proper divisors (38561755410).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19950749550 is a wasteful number, since it uses less digits than its factorization.

19950749550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86469 (or 86452 counting only the distinct ones).

The product of its (nonzero) digits is 2551500, while the sum is 54.

The spelling of 19950749550 in words is "nineteen billion, nine hundred fifty million, seven hundred forty-nine thousand, five hundred fifty".