4997651778 has 64 divisors (see below), whose sum is σ = 12699555840. Its totient is φ = 1427101200.

The previous prime is 4997651767. The next prime is 4997651797. The reversal of 4997651778 is 8771567994.

4997651778 is a `hidden beast` number, since 49 + 9 + 7 + 6 + 517 + 78 = 666.

It is a super-2 number, since 2×4997651778² = 49953046588293122568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1135963 + ... + 1140353.

It is an arithmetic number, because the mean of its divisors is an integer number (198430560).

Almost surely, 2^4997651778 is an apocalyptic number.

4997651778 is an abundant number, since it is smaller than the sum of its proper divisors (7701904062).

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

4997651778 is a wasteful number, since it uses less digits than its factorization.

4997651778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7420 (or 7414 counting only the distinct ones).

The product of its digits is 26671680, while the sum is 63.

The square root of 4997651778 is about 70694.0717316523. The cubic root of 4997651778 is about 1709.7082112163.

The spelling of 4997651778 in words is "four billion, nine hundred ninety-seven million, six hundred fifty-one thousand, seven hundred seventy-eight".