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661142953 is a prime number
BaseRepresentation
bin100111011010000…
…011110110101001
31201002001112122001
4213122003312221
52323223033303
6145334331001
722245423322
oct4732036651
91632045561
10661142953
1130a21a539
121654b9a61
13a6c85b63
1463b41449
153d09931d
hex27683da9

661142953 has 2 divisors, whose sum is σ = 661142954. Its totient is φ = 661142952.

The previous prime is 661142929. The next prime is 661142959. The reversal of 661142953 is 359241166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 571783744 + 89359209 = 23912^2 + 9453^2 .

It is a cyclic number.

It is not a de Polignac number, because 661142953 - 229 = 124272041 is a prime.

It is a super-2 number, since 2×6611429532 = 874220008603120418, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (661142959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330571476 + 330571477.

It is an arithmetic number, because the mean of its divisors is an integer number (330571477).

Almost surely, 2661142953 is an apocalyptic number.

It is an amenable number.

661142953 is a deficient number, since it is larger than the sum of its proper divisors (1).

661142953 is an equidigital number, since it uses as much as digits as its factorization.

661142953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 37.

The square root of 661142953 is about 25712.7002277085. The cubic root of 661142953 is about 871.1610661734.

The spelling of 661142953 in words is "six hundred sixty-one million, one hundred forty-two thousand, nine hundred fifty-three".