20151698951389 has 2 divisors, whose sum is σ = 20151698951390. Its totient is φ = 20151698951388.

The previous prime is 20151698951383. The next prime is 20151698951401. The reversal of 20151698951389 is 98315989615102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13271937166489 + 6879761784900 = 3643067^2 + 2622930^2 .

It is a cyclic number.

It is not a de Polignac number, because 20151698951389 - 2¹³ = 20151698943197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20151698951383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10075849475694 + 10075849475695.

It is an arithmetic number, because the mean of its divisors is an integer number (10075849475695).

Almost surely, 2^{20151698951389} is an apocalyptic number.

It is an amenable number.

20151698951389 is a deficient number, since it is larger than the sum of its proper divisors (1).

20151698951389 is an equidigital number, since it uses as much as digits as its factorization.

20151698951389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41990400, while the sum is 67.

The spelling of 20151698951389 in words is "twenty trillion, one hundred fifty-one billion, six hundred ninety-eight million, nine hundred fifty-one thousand, three hundred eighty-nine".