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BaseRepresentation
bin111110001010000011…
…101111110011010010
320101021021111020221002
4332022003233303102
52043141112404344
650354341502002
74551616664462
oct761203576322
9211237436832
1066740747474
1126339459445
1210b27411902
1363a813116b
143331c05ba2
151b0940b44e
hexf8a0efcd2

66740747474 has 8 divisors (see below), whose sum is σ = 106000010748. Its totient is φ = 31407410560.

The previous prime is 66740747443. The next prime is 66740747477. The reversal of 66740747474 is 47474704766.

It can be written as a sum of positive squares in 2 ways, for example, as 66736972225 + 3775249 = 258335^2 + 1943^2 .

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

It is not an unprimeable number, because it can be changed into a prime (66740747477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 981481547 + ... + 981481614.

Almost surely, 266740747474 is an apocalyptic number.

66740747474 is a deficient number, since it is larger than the sum of its proper divisors (39259263274).

66740747474 is a wasteful number, since it uses less digits than its factorization.

66740747474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1962963180.

The product of its (nonzero) digits is 22127616, while the sum is 56.

The spelling of 66740747474 in words is "sixty-six billion, seven hundred forty million, seven hundred forty-seven thousand, four hundred seventy-four".