1455666421 has 6 divisors (see below), whose sum is σ = 1600030166. Its totient is φ = 1323333000.

The previous prime is 1455666391. The next prime is 1455666427. The reversal of 1455666421 is 1246665541.

It can be written as a sum of positive squares in only one way, i.e., 1242915025 + 212751396 = 35255^2 + 14586^2 .

It is not a de Polignac number, because 1455666421 - 2⁹ = 1455665909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1455666427) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6015030 + ... + 6015271.

Almost surely, 2^1455666421 is an apocalyptic number.

1455666421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1455666421 is a deficient number, since it is larger than the sum of its proper divisors (144363745).

1455666421 is a wasteful number, since it uses less digits than its factorization.

1455666421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12030323 (or 12030312 counting only the distinct ones).

The product of its digits is 172800, while the sum is 40.

The square root of 1455666421 is about 38153.1967336945. The cubic root of 1455666421 is about 1133.3236578086.

The spelling of 1455666421 in words is "one billion, four hundred fifty-five million, six hundred sixty-six thousand, four hundred twenty-one".