68661521494 has 8 divisors (see below), whose sum is σ = 103128337728. Its totient is φ = 34285408920.

The previous prime is 68661521479. The next prime is 68661521497. The reversal of 68661521494 is 49412516686.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68661521497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22674022 + ... + 22677049.

It is an arithmetic number, because the mean of its divisors is an integer number (12891042216).

Almost surely, 2^68661521494 is an apocalyptic number.

68661521494 is a deficient number, since it is larger than the sum of its proper divisors (34466816234).

68661521494 is a wasteful number, since it uses less digits than its factorization.

68661521494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45351830.

The product of its digits is 2488320, while the sum is 52.

The spelling of 68661521494 in words is "sixty-eight billion, six hundred sixty-one million, five hundred twenty-one thousand, four hundred ninety-four".