997155647942 has 32 divisors (see below), whose sum is σ = 1540077162624. Its totient is φ = 483924902400.

The previous prime is 997155647893. The next prime is 997155647951. The reversal of 997155647942 is 249746551799.

It is a happy number.

997155647942 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 23498288 + ... + 23540684.

It is an arithmetic number, because the mean of its divisors is an integer number (48127411332).

Almost surely, 2^997155647942 is an apocalyptic number.

997155647942 is a deficient number, since it is larger than the sum of its proper divisors (542921514682).

997155647942 is a wasteful number, since it uses less digits than its factorization.

997155647942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43904.

The product of its digits is 171460800, while the sum is 68.

The spelling of 997155647942 in words is "nine hundred ninety-seven billion, one hundred fifty-five million, six hundred forty-seven thousand, nine hundred forty-two".