70991021640 has 768 divisors, whose sum is σ = 289460044800. Its totient is φ = 13731379200.

The previous prime is 70991021617. The next prime is 70991021663. The reversal of 70991021640 is 4612019907.

It is an interprime number because it is at equal distance from previous prime (70991021617) and next prime (70991021663).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 74963647 + ... + 74964593.

It is an arithmetic number, because the mean of its divisors is an integer number (376901100).

Almost surely, 2^70991021640 is an apocalyptic number.

70991021640 is a gapful number since it is divisible by the number (70) 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 70991021640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144730022400).

70991021640 is an abundant number, since it is smaller than the sum of its proper divisors (218469023160).

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

70991021640 is a wasteful number, since it uses less digits than its factorization.

70991021640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066 (or 1055 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 39.

The spelling of 70991021640 in words is "seventy billion, nine hundred ninety-one million, twenty-one thousand, six hundred forty".