20115661522 has 16 divisors (see below), whose sum is σ = 32985273600. Its totient is φ = 9124389040.

The previous prime is 20115661507. The next prime is 20115661543. The reversal of 20115661522 is 22516651102.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 943897 + ... + 964972.

It is an arithmetic number, because the mean of its divisors is an integer number (2061579600).

Almost surely, 2^20115661522 is an apocalyptic number.

20115661522 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20115661522 is a deficient number, since it is larger than the sum of its proper divisors (12869612078).

20115661522 is a wasteful number, since it uses less digits than its factorization.

20115661522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1909361.

The product of its (nonzero) digits is 7200, while the sum is 31.

The spelling of 20115661522 in words is "twenty billion, one hundred fifteen million, six hundred sixty-one thousand, five hundred twenty-two".