123451420665 has 16 divisors (see below), whose sum is σ = 199368278208. Its totient is φ = 65225422656.

The previous prime is 123451420657. The next prime is 123451420681. The reversal of 123451420665 is 566024154321.

It is not a de Polignac number, because 123451420665 - 2³ = 123451420657 is a prime.

It is a Curzon 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, 38456782 + ... + 38459991.

It is an arithmetic number, because the mean of its divisors is an integer number (12460517388).

Almost surely, 2^123451420665 is an apocalyptic number.

123451420665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123451420665 is a deficient number, since it is larger than the sum of its proper divisors (75916857543).

123451420665 is a wasteful number, since it uses less digits than its factorization.

123451420665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76916888.

The product of its (nonzero) digits is 172800, while the sum is 39.

Adding to 123451420665 its reverse (566024154321), we get a palindrome (689475574986).

The spelling of 123451420665 in words is "one hundred twenty-three billion, four hundred fifty-one million, four hundred twenty thousand, six hundred sixty-five".