19951346971650 has 48 divisors (see below), whose sum is σ = 49500423314784. Its totient is φ = 5318092222080.

The previous prime is 19951346971639. The next prime is 19951346971651. The reversal of 19951346971650 is 5617964315991.

It is not an unprimeable number, because it can be changed into a prime (19951346971651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27983907 + ... + 28688006.

It is an arithmetic number, because the mean of its divisors is an integer number (1031258819058).

Almost surely, 2^{19951346971650} is an apocalyptic number.

19951346971650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19951346971650 is an abundant number, since it is smaller than the sum of its proper divisors (29549076343134).

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

19951346971650 is a wasteful number, since it uses less digits than its factorization.

19951346971650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56674275 (or 56674270 counting only the distinct ones).

The product of its (nonzero) digits is 55112400, while the sum is 66.

The spelling of 19951346971650 in words is "nineteen trillion, nine hundred fifty-one billion, three hundred forty-six million, nine hundred seventy-one thousand, six hundred fifty".