7985661958 has 8 divisors (see below), whose sum is σ = 12006286560. Its totient is φ = 3983566440.

The previous prime is 7985661949. The next prime is 7985661979. The reversal of 7985661958 is 8591665897.

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

It is a self number, because there is not a number n which added to its sum of digits gives 7985661958.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4631193 + ... + 4632916.

It is an arithmetic number, because the mean of its divisors is an integer number (1500785820).

Almost surely, 2^7985661958 is an apocalyptic number.

7985661958 is a deficient number, since it is larger than the sum of its proper divisors (4020624602).

7985661958 is a wasteful number, since it uses less digits than its factorization.

7985661958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9264542.

The product of its digits is 32659200, while the sum is 64.

The square root of 7985661958 is about 89362.5310630803. The cubic root of 7985661958 is about 1998.8044486375.

The spelling of 7985661958 in words is "seven billion, nine hundred eighty-five million, six hundred sixty-one thousand, nine hundred fifty-eight".