68951139840 has 1600 divisors, whose sum is σ = 298029853440. Its totient is φ = 15049359360.

The previous prime is 68951139839. The next prime is 68951139869. The reversal of 68951139840 is 4893115986.

68951139840 is a `hidden beast` number, since 6 + 89 + 511 + 3 + 9 + 8 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 1603514859 + ... + 1603514901.

Almost surely, 2^68951139840 is an apocalyptic number.

68951139840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68951139840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149014926720).

68951139840 is an abundant number, since it is smaller than the sum of its proper divisors (229078713600).

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

68951139840 is a wasteful number, since it uses less digits than its factorization.

68951139840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

The spelling of 68951139840 in words is "sixty-eight billion, nine hundred fifty-one million, one hundred thirty-nine thousand, eight hundred forty".