100661111551 has 36 divisors (see below), whose sum is σ = 138322820664. Its totient is φ = 72403531200.

The previous prime is 100661111531. The next prime is 100661111557. The reversal of 100661111551 is 155111166001.

It is not a de Polignac number, because 100661111551 - 2²³ = 100652722943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100661111557) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 461440 + ... + 643621.

It is an arithmetic number, because the mean of its divisors is an integer number (3842300574).

Almost surely, 2^100661111551 is an apocalyptic number.

100661111551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

100661111551 is a deficient number, since it is larger than the sum of its proper divisors (37661709113).

100661111551 is a wasteful number, since it uses less digits than its factorization.

100661111551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105112 (or 1105092 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 28.

Adding to 100661111551 its reverse (155111166001), we get a palindrome (255772277552).

It can be divided in two parts, 100661 and 111551, that added together give a palindrome (212212).

The spelling of 100661111551 in words is "one hundred billion, six hundred sixty-one million, one hundred eleven thousand, five hundred fifty-one".