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66678899 = 716358439
BaseRepresentation
bin1111111001011…
…1000001110011
311122110122020212
43332113001303
5114032211044
610341054335
71436522060
oct376270163
9148418225
1066678899
1134702931
121a3b73ab
1310a77c91
148bd9c67
155cc1a9e
hex3f97073

66678899 has 8 divisors (see below), whose sum is σ = 76673280. Its totient is φ = 56801736.

The previous prime is 66678881. The next prime is 66678901. The reversal of 66678899 is 99887666.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-66678899 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (66672899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28079 + ... + 30360.

It is an arithmetic number, because the mean of its divisors is an integer number (9584160).

Almost surely, 266678899 is an apocalyptic number.

66678899 is a deficient number, since it is larger than the sum of its proper divisors (9994381).

66678899 is a wasteful number, since it uses less digits than its factorization.

66678899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58609.

The product of its digits is 7838208, while the sum is 59.

The square root of 66678899 is about 8165.7148492952. The cubic root of 66678899 is about 405.5049313623.

The spelling of 66678899 in words is "sixty-six million, six hundred seventy-eight thousand, eight hundred ninety-nine".

Divisors: 1 7 163 1141 58439 409073 9525557 66678899