1001111015551 has 8 divisors (see below), whose sum is σ = 1008821621808. Its totient is φ = 993401448000.

The previous prime is 1001111015533. The next prime is 1001111015621. The reversal of 1001111015551 is 1555101111001.

It is a happy number.

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 1001111015551 - 2⁵ = 1001111015519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001111015851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1734061 + ... + 2238121.

It is an arithmetic number, because the mean of its divisors is an integer number (126102702726).

Almost surely, 2^{1001111015551} is an apocalyptic number.

1001111015551 is a deficient number, since it is larger than the sum of its proper divisors (7710606257).

1001111015551 is a wasteful number, since it uses less digits than its factorization.

1001111015551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519353.

The product of its (nonzero) digits is 125, while the sum is 22.

Adding to 1001111015551 its reverse (1555101111001), we get a palindrome (2556212126552).

The spelling of 1001111015551 in words is "one trillion, one billion, one hundred eleven million, fifteen thousand, five hundred fifty-one".