11051661501 has 6 divisors (see below), whose sum is σ = 15963511070. Its totient is φ = 7367774328.

The previous prime is 11051661499. The next prime is 11051661521. The reversal of 11051661501 is 10516615011.

It can be written as a sum of positive squares in only one way, i.e., 9120059001 + 1931602500 = 95499^2 + 43950^2 .

It is not a de Polignac number, because 11051661501 - 2¹ = 11051661499 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 (11051661521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 613981186 + ... + 613981203.

Almost surely, 2^11051661501 is an apocalyptic number.

It is an amenable number.

11051661501 is a deficient number, since it is larger than the sum of its proper divisors (4911849569).

11051661501 is a wasteful number, since it uses less digits than its factorization.

11051661501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1227962395 (or 1227962392 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 27.

The spelling of 11051661501 in words is "eleven billion, fifty-one million, six hundred sixty-one thousand, five hundred one".