11651471540 has 12 divisors (see below), whose sum is σ = 24468090276. Its totient is φ = 4660588608.

The previous prime is 11651471539. The next prime is 11651471581. The reversal of 11651471540 is 4517415611.

It can be written as a sum of positive squares in 2 ways, for example, as 3813556516 + 7837915024 = 61754^2 + 88532^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 11651471540.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 291286769 + ... + 291286808.

It is an arithmetic number, because the mean of its divisors is an integer number (2039007523).

Almost surely, 2^11651471540 is an apocalyptic number.

11651471540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11651471540 is an abundant number, since it is smaller than the sum of its proper divisors (12816618736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11651471540 is a wasteful number, since it uses less digits than its factorization.

11651471540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582573586 (or 582573584 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 35.

The spelling of 11651471540 in words is "eleven billion, six hundred fifty-one million, four hundred seventy-one thousand, five hundred forty".