20151698951645 has 8 divisors (see below), whose sum is σ = 24189463397304. Its totient is φ = 16116409391104.

The previous prime is 20151698951627. The next prime is 20151698951651. The reversal of 20151698951645 is 54615989615102.

It can be written as a sum of positive squares in 4 ways, for example, as 3633831000121 + 16517867951524 = 1906261^2 + 4064218^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20151698951645 - 2⁸ = 20151698951389 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 618703364 + ... + 618735933.

It is an arithmetic number, because the mean of its divisors is an integer number (3023682924663).

Almost surely, 2^{20151698951645} is an apocalyptic number.

It is an amenable number.

20151698951645 is a deficient number, since it is larger than the sum of its proper divisors (4037764445659).

20151698951645 is a wasteful number, since it uses less digits than its factorization.

20151698951645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237442559.

The product of its (nonzero) digits is 23328000, while the sum is 62.

The spelling of 20151698951645 in words is "twenty trillion, one hundred fifty-one billion, six hundred ninety-eight million, nine hundred fifty-one thousand, six hundred forty-five".