611881523617 has 48 divisors (see below), whose sum is σ = 813770012160. Its totient is φ = 454442752512.

The previous prime is 611881523599. The next prime is 611881523629. The reversal of 611881523617 is 716325188116.

It is a happy number.

It is not a de Polignac number, because 611881523617 - 2⁷ = 611881523489 is a prime.

It is a super-2 number, since 2×611881523617² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (611881583617) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4029648 + ... + 4178734.

It is an arithmetic number, because the mean of its divisors is an integer number (16953541920).

Almost surely, 2^611881523617 is an apocalyptic number.

It is an amenable number.

611881523617 is a deficient number, since it is larger than the sum of its proper divisors (201888488543).

611881523617 is a wasteful number, since it uses less digits than its factorization.

611881523617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149510 (or 149503 counting only the distinct ones).

The product of its digits is 483840, while the sum is 49.

The spelling of 611881523617 in words is "six hundred eleven billion, eight hundred eighty-one million, five hundred twenty-three thousand, six hundred seventeen".