2661531523406 has 32 divisors (see below), whose sum is σ = 4576909639680. Its totient is φ = 1137087516096.

The previous prime is 2661531523351. The next prime is 2661531523423. The reversal of 2661531523406 is 6043251351662.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14752115 + ... + 14931441.

It is an arithmetic number, because the mean of its divisors is an integer number (143028426240).

Almost surely, 2^{2661531523406} is an apocalyptic number.

2661531523406 is a deficient number, since it is larger than the sum of its proper divisors (1915378116274).

2661531523406 is a wasteful number, since it uses less digits than its factorization.

2661531523406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182648.

The product of its (nonzero) digits is 777600, while the sum is 44.

The spelling of 2661531523406 in words is "two trillion, six hundred sixty-one billion, five hundred thirty-one million, five hundred twenty-three thousand, four hundred six".