706547128421 has 4 divisors (see below), whose sum is σ = 706862976492. Its totient is φ = 706231280352.

The previous prime is 706547128393. The next prime is 706547128429. The reversal of 706547128421 is 124821745607.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124821745607 = 13 ⋅9601672739.

It can be written as a sum of positive squares in 2 ways, for example, as 667552727521 + 38994400900 = 817039^2 + 197470^2 .

It is a cyclic number.

It is not a de Polignac number, because 706547128421 - 2³⁴ = 689367259237 is a prime.

It is a super-2 number, since 2×706547128421² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (706547128429) 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, 157920680 + ... + 157925153.

It is an arithmetic number, because the mean of its divisors is an integer number (176715744123).

Almost surely, 2^706547128421 is an apocalyptic number.

It is an amenable number.

706547128421 is a deficient number, since it is larger than the sum of its proper divisors (315848071).

706547128421 is a wasteful number, since it uses less digits than its factorization.

706547128421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315848070.

The product of its (nonzero) digits is 752640, while the sum is 47.

The spelling of 706547128421 in words is "seven hundred six billion, five hundred forty-seven million, one hundred twenty-eight thousand, four hundred twenty-one".