11661771554 has 8 divisors (see below), whose sum is σ = 18521637228. Its totient is φ = 5487892480.

The previous prime is 11661771529. The next prime is 11661771599. The reversal of 11661771554 is 45517716611.

It can be written as a sum of positive squares in 2 ways, for example, as 11659032529 + 2739025 = 107977^2 + 1655^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171496607 + ... + 171496674.

Almost surely, 2^11661771554 is an apocalyptic number.

11661771554 is a deficient number, since it is larger than the sum of its proper divisors (6859865674).

11661771554 is a wasteful number, since it uses less digits than its factorization.

11661771554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342993300.

The product of its digits is 176400, while the sum is 44.

The spelling of 11661771554 in words is "eleven billion, six hundred sixty-one million, seven hundred seventy-one thousand, five hundred fifty-four".